It seems that Mean_Mr_Mustard was right ...Achording to this: http://www.beatlesbible.com/features/beatles-bbc-radio-recordings/Ask Me WhyTeenager's Turn - Here We GoRecorded: 11 June 1962Broadcast: 15 June 1962And Here We Go (with Pete on drums):The Beatles - "Ask Me Why" (BBC Radio, "Here We Go" June 15, 1962)
Well I mentioned this to my mate from The Searchers and he confirmed what I have always thought to be the reason why ISHST wasn't their first singleGeorge Martin and Epstein both knew it was a re-write of a very famous song that everyone knows so they deferred it to an album track and released an original melody ie Love Me Do.A wise decision.
Sorry but which song is that?
It's harmonic structure is pretty much identical to When the Saints Go Marching In ( that's Allan Pollack's analysis not mine). The melody has more than a few similarities too.
They used to play "Saints' backing T Sheridan and a quick change of lyrics and emphasis on some words gives you a new song we used to play it in a band I was in and sometimes the singer would sing 'saints' lyrics on a verse just to vary things !
I never read that by Pollack, so I went to his site and found this by Ian Hammond ?http://www.icce.rug.nl/~soundscapes/VOLUME05/Oldsweetsongs.shtml